class Settings():
	"""存储外星人入侵的所有设置的类"""
	def __init__(self):
		"""初始化游戏的设置"""
		#屏幕设置
		self.screen_width = 1200
		self.screen_height = 800
		self.bg_color = (230, 230, 230)
		self.ship_speed_factor = 1.5
		self.bullet_speed_factor = 1
		self.bullet_width = 3
		self.bullet_height = 15
		self.bullet_color = (60, 60, 60)
		self.bullets_allowed = 3
